.color_change{
    padding: 50px 0;
    text-align: center;
}
.center{
    text-align: center;
    margin: 20px 0;
    a{
        margin-right: 50px;
        color: #000;
    }
}

.red{
    color: red;
}
.blue{
    color: blue;
}
.green{
    color: green;
}